[Openmp-commits] [openmp] [Libomptarget] Consolidate CPU offloading into 'host' directory (PR #86014)

[Tom Stellard via Openmp-commits]

================
@@ -0,0 +1,109 @@
+if(NOT CMAKE_SYSTEM_NAME MATCHES "Linux")
+  return()
+endif()
+
+  # build_generic_elf64("s390x" "S390X" "s390x" "systemz" "s390x-ibm-linux-gnu" "22")
+  # build_generic_elf64("aarch64" "aarch64" "aarch64" "aarch64" "aarch64-unknown-linux-gnu" "183")
+  # build_generic_elf64("ppc64" "PPC64" "ppc64" "ppc64" "powerpc64-ibm-linux-gnu" "21")
+  # build_generic_elf64("x86_64" "x86_64" "x86_64" "x86_64" "x86_64-pc-linux-gnu" "62")
+  # build_generic_elf64("ppc64le" "PPC64le" "ppc64" "ppc64le" "powerpc64le-ibm-linux-gnu" "21")
+set(supported_targets x86_64 aarch64 ppc64 ppc64le s390x)
+if(NOT ${CMAKE_SYSTEM_PROCESSOR} IN_LIST supported_targets)
+  libomptarget_say("Not building ${machine} NextGen offloading plugin")
+  return()
+endif()
+
+set(machine ${CMAKE_SYSTEM_PROCESSOR})
+if(CMAKE_SYSTEM_PROCESSOR MATCHES "ppc64le$")
+  set(machine ppc64)
+endif()
+
+add_llvm_library(omptarget.rtl.${machine} SHARED
+  src/rtl.cpp
+  ADDITIONAL_HEADER_DIRS
+    ${LIBOMPTARGET_INCLUDE_DIR}
+  LINK_LIBS PRIVATE
+    PluginCommon
+    ${OPENMP_PTHREAD_LIB}
+  NO_INSTALL_RPATH
+  BUILDTREE_ONLY
+)
+
+if(LIBOMPTARGET_DEP_LIBFFI_FOUND)
+  libomptarget_say("Building ${machine} plugin linked with libffi")
+  if(FFI_STATIC_LIBRARIES)
+    target_link_libraries(omptarget.rtl.${machine} PRIVATE FFI::ffi_static)
+  else()
+    target_link_libraries(omptarget.rtl.${machine} PRIVATE FFI::ffi)
+  endif()
+else()
+  libomptarget_say("Building ${machine} plugin for dlopened libffi")
+  target_sources(omptarget.rtl.${machine} PRIVATE dynamic_ffi/ffi.cpp)
+  target_include_directories(omptarget.rtl.${machine} PRIVATE dynamic_ffi)
+endif()
+
+if(OMPT_TARGET_DEFAULT AND LIBOMPTARGET_OMPT_SUPPORT)
+  target_link_libraries(omptarget.rtl.${machine} PRIVATE OMPT)
+endif()
+
+if(LIBOMP_HAVE_VERSION_SCRIPT_FLAG)
+  target_link_libraries(omptarget.rtl.${machine} PRIVATE
+    "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/../exports")
+endif()
+
+# Install plugin under the lib destination folder.
+install(TARGETS omptarget.rtl.${machine}
+        LIBRARY DESTINATION "${OPENMP_INSTALL_LIBDIR}")
+set_target_properties(omptarget.rtl.${machine} PROPERTIES
+  INSTALL_RPATH "$ORIGIN" BUILD_RPATH "$ORIGIN:${CMAKE_CURRENT_BINARY_DIR}/.."
+  POSITION_INDEPENDENT_CODE ON
+  CXX_VISIBILITY_PRESET protected)
+
+target_include_directories(omptarget.rtl.${machine} PRIVATE
+                           ${LIBOMPTARGET_INCLUDE_DIR})
+
+if(LIBOMPTARGET_DEP_LIBFFI_FOUND)
+  list(APPEND LIBOMPTARGET_TESTED_PLUGINS omptarget.rtl.${machine})
+  set(LIBOMPTARGET_TESTED_PLUGINS
+      "${LIBOMPTARGET_TESTED_PLUGINS}" PARENT_SCOPE)
+else()
+  libomptarget_say("Not generating ${tmachine_name} tests. LibFFI not found.")
+endif()
+
+# Define macro to be used as prefix of the runtime messages for this target.
+target_compile_definitions(omptarget.rtl.${machine} PRIVATE TARGET_NAME=${machine})
+# TODO: This should be automatized in Debug.h.
+target_compile_definitions(omptarget.rtl.${machine} PRIVATE
+                           DEBUG_PREFIX="TARGET ${machine} RTL")
+
+# Define the target specific triples and ELF machine values.
+if(CMAKE_SYSTEM_PROCESSOR MATCHES "ppc64le$" OR
+   CMAKE_SYSTEM_PROCESSOR MATCHES "ppc64$")
+  target_compile_definitions(omptarget.rtl.${machine} PRIVATE TARGET_ELF_ID=EM_PPC64)
+  target_compile_definitions(omptarget.rtl.${machine} PRIVATE
+      LIBOMPTARGET_NEXTGEN_GENERIC_PLUGIN_TRIPLE="powerpc64-ibm-linux-gnu")
+  list(APPEND LIBOMPTARGET_SYSTEM_TARGETS 
+       "powerpc64-ibm-linux-gnu" "powerpc64-ibm-linux-gnu-LTO")
----------------
tstellar wrote:

This is incorrect, because it is specifying a big-endian triple (powerpc64-ibm-linux-gnu) when the host is little-endian (ppc64le).  The ppc64le and ppc64 $CMAKE_SYSTEM_PROCESSOR values need to be handled separately.

cc @tuliom 

https://github.com/llvm/llvm-project/pull/86014